摘要:
The invention relates to a lift assembly (10) comprising: an article (42) to be lifted between a lowered position and a raised position; a flexible drive element (38) coupled to the article (42) and defining a longitudinal axis; a power mechanism coupled to the drive element (38); and a load cell assembly (562) positioned in contact with the drive element, the load cell assembly (562) comprising; a load cell housing (566); a first load cell member (570) contacting the drive element and movable relative to the load cell housing (566); a second load cell member (570) contacting the drive element at a position spaced from the first load cell member (570); and a load cell sensor coupled to the first load cell member (570) and operative to provide an output corresponding with a load on the drive element (38).
摘要:
A performance venue having a dynamic load management system for use in managing loads. The system uses a dead man circuit (34) as a means for determining the actual or anticipated dynamic load produced by moving loads (14), and then disables the system by opening the dead man circuit (34) when too many loads (14) are moved or selected to be moved. Preferably, the invention is embodied in a dead man circuit (34) is pure hardware, and is free of software components. The invention also provides a method of controlling movement of loads (14) in a performance venue having a plurality machines (18). In its basic form, the method comprises selecting at least one of the machines (18) for movement, closing a dead man circuit (34), and opening the dead man circuit (34) if the current in the dead man circuit (34) falls outside a predetermined range.